const state = {
    visitedViews: [],
    cachedViews: []
}

const mutations = {
ADD_VISITED_VIEW: (state, view) => {
    const { path, meta, meta: { title }, fullPath, name } = view
    if (state.visitedViews.some(v => v.path === path)) return
    state.visitedViews.push({ path, meta, title, fullPath, name })
},

ADD_CACHED_VIEW: (state, view) => {
    if (state.cachedViews.includes(view.name)) return
    if (!view.meta.noCache) {
        state.cachedViews.push(view.name)
    }
},

DEL_VISITED_VIEW: (state, view) => {
    for (const [i, v] of state.visitedViews.entries()) {
        if (v.path === view.path) {
            state.visitedViews.splice(i, 1)
            break
        }
    }
},
DEL_CACHED_VIEW: (state, view) => {
    const index = state.cachedViews.indexOf(view.name)
    index > -1 && state.cachedViews.splice(index, 1)
},

DEL_OTHERS_VISITED_VIEWS: (state, view) => {
    state.visitedViews = state.visitedViews.filter(v => {
        return v.meta.affix || v.path === view.path
    })
},
DEL_OTHERS_CACHED_VIEWS: (state, view) => {
    const index = state.cachedViews.indexOf(view.name)
    if (index > -1) {
        state.cachedViews = state.cachedViews.slice(index, index + 1)
    } else {
        // if index = -1, there is no cached tags
        state.cachedViews = []
    }
},

DEL_ALL_VISITED_VIEWS: state => {
    // keep affix tags
    const affixTags = state.visitedViews.filter(tag => tag.meta.affix)
    state.visitedViews = affixTags
},
DEL_ALL_CACHED_VIEWS: state => {
    state.cachedViews = []
},

UPDATE_VISITED_VIEW: (state, view) => {
    for (let v of state.visitedViews) {
        if (v.path === view.path) {
            v = Object.assign(v, view)
            break
        }
    }
}
}

const actions = {
    addView({ dispatch }, view) {
        dispatch('addVisitedView', view)
        dispatch('addCachedView', view)
    },
    addVisitedView({ commit }, view) {
        commit('ADD_VISITED_VIEW', view)
    },
    addCachedView({ commit }, view) {
        commit('ADD_CACHED_VIEW', view)
    },

    delView({ dispatch, state }, view) {
        return new Promise(resolve => {
            dispatch('delVisitedView', view)
            dispatch('delCachedView', view)
            resolve({
                visitedViews: [...state.visitedViews],
                cachedViews: [...state.cachedViews]
            })
        })
    },
    delVisitedView({ commit, state }, view) {
        return new Promise(resolve => {
            commit('DEL_VISITED_VIEW', view)
            resolve([...state.visitedViews])
        })
    },
    delCachedView({ commit, state }, view) {
        return new Promise(resolve => {
            commit('DEL_CACHED_VIEW', view)
            resolve([...state.cachedViews])
        })
    },

    delOthersViews({ dispatch, state }, view) {
        return new Promise(resolve => {
            dispatch('delOthersVisitedViews', view)
            dispatch('delOthersCachedViews', view)
            resolve({
                visitedViews: [...state.visitedViews],
                cachedViews: [...state.cachedViews]
            })
        })
    },
    delOthersVisitedViews({ commit, state }, view) {
        return new Promise(resolve => {
            commit('DEL_OTHERS_VISITED_VIEWS', view)
            resolve([...state.visitedViews])
        })
    },
    delOthersCachedViews({ commit, state }, view) {
        return new Promise(resolve => {
            commit('DEL_OTHERS_CACHED_VIEWS', view)
            resolve([...state.cachedViews])
        })
    },

    delAllViews({ dispatch, state }, view) {
        return new Promise(resolve => {
            dispatch('delAllVisitedViews', view)
            dispatch('delAllCachedViews', view)
            resolve({
                visitedViews: [...state.visitedViews],
                cachedViews: [...state.cachedViews]
            })
        })
    },
    delAllVisitedViews({ commit, state }) {
        return new Promise(resolve => {
            commit('DEL_ALL_VISITED_VIEWS')
            resolve([...state.visitedViews])
        })
    },
    delAllCachedViews({ commit, state }) {
        return new Promise(resolve => {
            commit('DEL_ALL_CACHED_VIEWS')
            resolve([...state.cachedViews])
        })
    },

    updateVisitedView({ commit }, view) {
        commit('UPDATE_VISITED_VIEW', view)
    }
}

export default {
    namespaced: true,
    state,
    mutations,
    actions
}
  